Patent
1980-06-03
1981-12-29
Hix, L. T.
G03B 1320
Patent
active
043079520
ABSTRACT:
An automatic focusing control apparatus focuses subjects in any one of a plurality of different camera-to-subject distance ranges by transmitting a sonar ranging signal and at the same time displacing an objective lens to move through a plurality of different focal positions corresponding respectively to the different camera-to-subject distance ranges, and thereafter detecting an echo signal from a subject and utilizing the detected echo signal to provide a specially timed control signal to ultimately stop the displacement of the objective lens at the appropriate focal position corresponding to the distance range in which the subject is located.
REFERENCES:
patent: 4040072 (1977-08-01), Johnson et al.
patent: 4148574 (1979-04-01), Johnson
patent: 4167316 (1979-09-01), Johnson et al.
patent: 4199244 (1980-04-01), Shenk
patent: 4199246 (1980-04-01), Muggli
Bagdis Judy
Johnson Bruce K.
Launie Kenneth J.
Whiteside George D.
Hix L. T,.
Perkey William B.
Polaroid Corporation
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